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I didn't get to try Zack's suggestion before my FreeBSD auto
build/test setup caught up with Guido's checkin.

With Guido's checkin, test_tempfile passes the TESTOPT="-l
-u network" test run that was previously failing.

OS/2 EMX actually had 2 problems:
- file/directory permissions behave like Windows, not Unix;
- EMX defaults to only 40 file handles.

I've checked in a small change to test_tempfile.py to deal
with the first issue (making it behave like Windows), and
checked in a Makefile change that ups the number of file
handles to 250.  I've also added notes to the port README
about ways of overriding the number of file handles.

I'm closing this patch as my issues are now resolved.